The Dodo Bird Verdict Is Alive and Well – Mostly
نویسندگان
چکیده
17 meta-analyses have been examined of comparisons of active treatments with each other, in contrast to the more usual comparisons of active treatments with controls. These meta-analyses yield a mean uncorrected absolute effect size for Cohen’s d of .20, which is small and non-significant (an equivalent Pearson’s r would be .10). Its smallness confirms Rosenzweig’s supposition in 1936 about the likely results of such comparisons. In the present sample, when such differences are then corrected for the therapeutic allegiance of the researchers involved in comparing the different psychotherapies, these differences tend to become even further reduced in size and significance, as shown in Luborsky et al. (1999).
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